![Sample our Environment & Sustainability journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5935/TOC-Subject-Sample-2021-Environment-Sustainability.jpg"})
Abstract
A disorder of Canada Muscat and Himrod grapes results in necrosis and breakdown of bunch stems near crop maturity. Berries and portions of bunches drop, in some years prior to or during harvest, resulting in substantial crop loss. Experiments were conducted at the Grape Research Station, Horticultural Research Institute of Ontario, Vineland Station, Ontario, Canada and in grower vineyards. Calcium and magnesium were applied in the form of dolomitic limestone in early spring or as foliar sprays. Three sprays of magnesium sulfate (40 kg/1000 L) or calcium chloride (5 kg/1000 L) were applied at 2‐week intervals beginning in mid‐July. Vines that received calcium or magnesium alone were compared to those that received both calcium and magnesium and to check vines which received no calcium or magnesium. Soil application of limestone reduced the extent of rachis necrosis and berry drop of Canada Muscat. Spray application of Ca and Mg also reduced the extent of rachis necrosis. Both cations were involved and their effect varied from year to year. Foliar applied magnesium chelate reduced the extent of berry drop with the cultivar Himrod in 1984 but had a smaller effect in 1985.